The relational database model requires the_爱下问搜题

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问题单项选择题

The relational database model requires the data be (110) through programs that don’t rely on the position of the data in the database. This is in direct (111) to the other database mode, where the program has to follow a series of pointers to the data it seeks. A program (112) a relational database simply asks for the data it seeks; the DBMS performs the necessary searches and (113) the information. The (114) on how the search is done are specific to the DBMS and vary from product to product.

A．consulting

B．containing

C．querying

D．queuing

答案

参考答案：C

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Healthy Food Paris
Spinach + Oranges Although spinach(菠菜) has lots of iron, your body doesn’t absorb(吸收) it well when spinach is eaten alone.But with vitamin(维生素) C by its side, this vegetable becomes a true hero.

Avocado + Tomato Tomatoes are a super food. Eat some avocado(鳄梨) at the same time and you’ve got a super super food, because the fat in the avocado helps the body absorb seven times more lycopene(番茄红素).

Green Tea + Lemon Drinking several cups of green tea is a good habit, because it can protect your heart. But if you intake some vitamin C at the same time, it can’t be better. The vitamin C in lemons helps your body absorb 13 times more catechins(儿茶酚) than it can get from tea alone.

小题1: Which food pair is correct when you eat according to the passage?

A．Catechins + Lycopene	B．Avocado+Oranges.
C．Black tea+Lemon	D．Spinach+Lemon

小题2: Why do we eat oranges with Spinach?

A．Because Spinach has lots of iron.

B．Because oranges have much vitamin C which can help absorb iron in spinach.

C．Because vegetables should be eaten with fruits.

D．Because vegetables should be eaten with fruits.

小题3: What can help body absorb more lycopene?

A．Fat in the avocado	B．Vitamin C in oranges
C．Vitamin C in tomatoes	D．Fat in tomatoes

小题4: Which of the following pairs do not need vitamin C to help?

A．Spinach and oranges	B．Avocado and tomato
C．Green tea and lemon	D．Oranges and tomato

小题5: If Henry’s father has something wrong with his heart, which choice is best of for his health?

选择题

下图是某地区1950～1980年人口增长图。读图回答小题。

小题1:30年间该地区：（）

A．乡村人口增长了2000万人

B．城市人口增长了500万人

C．总人口增长了两倍

D．乡村人口增长了两倍小题2:30年间该地区城市化水平（）

A．大幅提高

B．略有提高

C．没有变化

D．略有下降